Malicious PDF — malware analysis report

Static analysis result for SHA-256 3119b67675b64631…

MALICIOUS

PDF

101.4 KB Created: 2021-09-04 01:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66bff35a2b65ea37e293bdb76bb6eaca SHA-1: 8f8c44f795648fc6416c0a40d12c7579eda57a39 SHA-256: 3119b67675b64631367defee0f7e950d9e943c4524191773367d4bb927bb93ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms hosted on disposable domains. This suggests the PDF is designed to lure users to potentially malicious websites, likely for phishing or to download further malware. The presence of external URI links and compromised CMS uploads indicates a multi-stage attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://karimeh.com/public/userfiles/file/90530974479.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8892617ed0e3bd1b09fad4063349a717/55063160832.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/17682699940.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210613_041803.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/46548726348.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/8749153694.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/q7bmmdo9of0vfbkb39u6pfa04p/gasejazezupatunupinubuva.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29795553f---13549400669.pdfIn PDF document text
    • https://irantruck.ir/data/file/xixaporiw.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e1ov8pamqd7295stuu052cf2i2/14329504612.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/tatebubejowategegivolo.pdfIn PDF document text
    • https://retta-bg.com/userfiles/11284542224.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0801da9b9---binojarepodakokaw.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s069tfr7nk5cgpfs9kdvehbfdr/dazuwaripowukunogot.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/deredusarawozot.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/40e74d7c7240ec75dd3d681c7e57684c/23545358883.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210823_171406.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/e1e847utmglel5hsceg2538vnq/najepolinajovexasomodu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608796d925511---rafunepunisinimomatirudo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9139e7488---noroxuzujos.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/9150141076.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/dapenegaxuri.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085065569f57---komukoritexosirabikiwi.pdfIn PDF document text
    • https://biocoils.com/img/file/67381412881.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/52603706539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gromacs+manual+2019PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 18940 bytes
SHA-256: 3d21b7eefbbe79baf5c37365e776bd1932e02c59c68e437d081361b615e9855d
font_01_sfnt_off0001574b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574B 10672 bytes
SHA-256: 33d8f639da95a3042eeb2075493d6486fd5f9f4c63f1876dc356aa95c0b2fd17
font_02_sfnt_off00016fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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